Description

Draws an elliptical arc from the current point to (x, y) using relative
coordinates.
The size and orientation of the ellipse are defined by two radii (rx, ry)
and an xAxisRotation, which indicates how the ellipse as a whole is
rotated relative to the current coordinate system.
The center (cx, cy) of the ellipse is calculated automagically to satisfy
the constraints imposed by the other parameters.
largeArcFlag and sweepFlag contribute to the automatic calculations and
help determine how the arc is drawn.
If largeArcFlag is true then draw the larger of the available arcs.
If sweepFlag is true, then draw the arc matching a clock-wise rotation.

A description of each parameter follows:

drw_wnd

A DrawingWand resource

rx

X radius

ry

Y radius

x_axis_rotation

Indicates how the ellipse as a whole is rotated relative to the current coordinate system